build(deps): bump github.com/sashabaranov/go-openai

Bumps [github.com/sashabaranov/go-openai](https://github.com/sashabaranov/go-openai) from 1.17.9 to 1.20.3.
- [Release notes](https://github.com/sashabaranov/go-openai/releases)
- [Commits](sashabaranov/go-openai@v1.17.9...v1.20.3)

---
updated-dependencies:
- dependency-name: github.com/sashabaranov/go-openai
  dependency-type: direct:production
  update-type: version-update:semver-minor
...

Signed-off-by: dependabot[bot] <support@github.com>

go.mod

@@ -8,7 +8,7 @@ require (
 	github.com/charmbracelet/glamour v0.6.0
 	github.com/charmbracelet/lipgloss v0.9.1
 	github.com/mitchellh/go-homedir v1.1.0
-	github.com/sashabaranov/go-openai v1.17.9
+	github.com/sashabaranov/go-openai v1.20.3
 	github.com/spf13/viper v1.18.1
 	github.com/stretchr/testify v1.8.4
 )

go.sum

@@ -80,8 +80,8 @@ github.com/sagikazarmark/locafero v0.4.0 h1:HApY1R9zGo4DBgr7dqsTH/JJxLTTsOt7u6ke
 github.com/sagikazarmark/locafero v0.4.0/go.mod h1:Pe1W6UlPYUk/+wc/6KFhbORCfqzgYEpgQ3O5fPuL3H4=
 github.com/sagikazarmark/slog-shim v0.1.0 h1:diDBnUNK9N/354PgrxMywXnAwEr1QZcOr6gto+ugjYE=
 github.com/sagikazarmark/slog-shim v0.1.0/go.mod h1:SrcSrq8aKtyuqEI1uvTDTK1arOWRIczQRv+GVI1AkeQ=
-github.com/sashabaranov/go-openai v1.17.9 h1:QEoBiGKWW68W79YIfXWEFZ7l5cEgZBV4/Ow3uy+5hNY=
-github.com/sashabaranov/go-openai v1.17.9/go.mod h1:lj5b/K+zjTSFxVLijLSTDZuP7adOgerWeFyZLUhAKRg=
+github.com/sashabaranov/go-openai v1.20.3 h1:JMhaSfE1mLznYIvlf8odxbyWGiFFGnQjyLw00I9R4fU=
+github.com/sashabaranov/go-openai v1.20.3/go.mod h1:lj5b/K+zjTSFxVLijLSTDZuP7adOgerWeFyZLUhAKRg=
 github.com/sourcegraph/conc v0.3.0 h1:OQTbbt6P72L20UqAkXXuLOj79LfEanQ+YQFNpLA9ySo=
 github.com/sourcegraph/conc v0.3.0/go.mod h1:Sdozi7LEKbFPqYX2/J+iBAM6HpqSLTASQIKqDmF7Mt0=
 github.com/spf13/afero v1.11.0 h1:WJQKhtpdm3v2IzqG8VMqrr6Rf3UYpEF239Jy9wNepM8=